AirHint found the following cheapest return flights from London (LHR) to Sofia (SOF) in August 2025 (see full year).

Return flights

19 Aug - 30 Sep	Vueling Airlines
22 Aug - 05 Sep	SWISS
29 Aug - 05 Sep	SWISS
24 Aug - 17 Sep	Lufthansa
24 Aug - 05 Sep	Lufthansa
31 Aug - 14 Sep	Lufthansa
31 Aug - 19 Sep	Aegean Airlines
24 Aug - 08 Sep	Lufthansa
29 Aug - 12 Sep	Lufthansa
25 Aug - 08 Sep	Lufthansa
06 Aug - 12 Aug	Lufthansa
12 Aug - 14 Aug	SWISS
13 Aug - 21 Aug	SWISS
19 Aug - 21 Aug	SWISS
06 Aug - 13 Aug	Austrian Airlines
11 Aug - 12 Aug	Lufthansa
24 Aug - 27 Aug	Lufthansa
21 Aug - 27 Aug	Lufthansa
20 Aug - 27 Aug	Lufthansa
08 Aug - 11 Aug	SWISS

Also check the deals for one-way flights from London to Sofia in August.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from London to Sofia in August from 164€

Return flights